Three state polarization detection method for eliminating linear birefringence influence of optical current transformer

A current transformer, linear birefringence technology, applied in the direction of measuring current/voltage, instruments, measuring devices, etc., can solve problems such as linear birefringence that cannot be ruled out

Inactive Publication Date: 2008-03-26
HARBIN ENG UNIV
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Problems solved by technology

[0008] This shows that the traditional subtraction and detection scheme cannot exclude the influence of linear birefringence. Since linear birefringence is easily affected by temperature and irregular changes, the current to be measured calculated by the subtraction and detection scheme is subject to external factors such as temperature. The influence of environmental factors, which is one of the key technical obstacles of OCT

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  • Three state polarization detection method for eliminating linear birefringence influence of optical current transformer
  • Three state polarization detection method for eliminating linear birefringence influence of optical current transformer
  • Three state polarization detection method for eliminating linear birefringence influence of optical current transformer

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[0024] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0025] The experimental light source adopts LED3S403 SLD of Wuhan Telecom, with a center wavelength of 1290nm; the sensor head is made of ZF-7 glass, and the reflective surface is coated with a single layer of polarization-maintaining dielectric film; the PMS-2 optical power meter is used to measure the intensity of the polarized light; tor output 1KA. Local electric heating is used for the optical sensing head to achieve temperature control. The temperature of the sensor head is at six values ​​from 24.2°C to 42.6°C, and the system is built according to the optical path shown in Figure 2. The 45° polarized light emitted by the light source E in Injected into the sensing head of the sensor, after three reflections, it is divided into four sensing arms, and after a circle around the sensing head, the output light E out After passing through the non-polarization e...

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Abstract

This invention provides a kind of triple polarized detection method which can remove the linear birefringence influence in optic current transformer. It measures the light intensity in three direction of polarization of ellipse polarized light output by the optic current transformer, that is the data of the level polarized intensity, the uprightness polarized intensity and the 45 degree with the level direction polarized intensity, uses the triple measurement data calculates the phasic difference information between level polarized component and uprightness polarized component, separates and detect the Faraday effect and linear birefringence in real time. The triple ellipse polarized detection project of ellipse polarized light advances in this invention can realize that the measurement of the linear birefringence and the detected current be correct and in real time by using the Faraday magneto-optic effect optic current transformer, and it can be applied in more broad field of ellipse polarized light measurement.

Description

(1) Technical field [0001] The invention relates to a data detection and processing method in an optical current transformer, specifically a data detection and processing method for eliminating the influence of linear birefringence in an optical current transformer with Faraday magneto-optic effect. (2) Background technology [0002] The working voltage of the current power system is increasing day by day, and the demand for high-precision, large-range, safe and reliable new current transformers is becoming increasingly strong, and a huge potential market for new current transformers is forming. Optical Current Transformer (OCT) is a new technology in the field of high-voltage and large-current measurement, which is of great significance to power measurement and protection. The advantages of OCT, such as no explosion, no magnetic saturation, no hysteresis, small size and light weight, have been recognized and concerned by many researchers. Although the research on OCT has a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/00
Inventor 康崇黄宗军
Owner HARBIN ENG UNIV
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